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1 | // Boost.Bimap | |
2 | // | |
3 | // Copyright (c) 2006-2007 Matias Capeletto | |
4 | // | |
5 | // Distributed under the Boost Software License, Version 1.0. | |
6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | /// \file container_adaptor/detail/functor_bag.hpp | |
10 | /// \brief Defines a EBO optimizacion helper for functors. | |
11 | ||
12 | #ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP | |
13 | #define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP | |
14 | ||
15 | #if defined(_MSC_VER) | |
16 | #pragma once | |
17 | #endif | |
18 | ||
19 | #include <boost/config.hpp> | |
20 | ||
21 | #if defined(BOOST_MSVC) | |
22 | // This bogus warning will appear when add_const is applied to a | |
23 | // const volatile reference because we can't detect const volatile | |
24 | // references with MSVC6. | |
25 | # pragma warning(push) | |
26 | # pragma warning(disable:4181) | |
27 | // warning C4181: qualifier applied to reference type ignored | |
28 | #endif | |
29 | ||
30 | #include <boost/mpl/placeholders.hpp> | |
31 | ||
32 | #include <boost/type_traits/add_reference.hpp> | |
33 | #include <boost/type_traits/is_base_of.hpp> | |
34 | ||
35 | #include <boost/mpl/inherit_linearly.hpp> | |
36 | #include <boost/mpl/inherit.hpp> | |
37 | ||
38 | namespace boost { | |
39 | namespace bimaps { | |
40 | namespace container_adaptor { | |
41 | namespace detail { | |
42 | ||
43 | /// \brief EBO optimizacion helper for functors | |
44 | /** | |
45 | ||
46 | This class is a generalization of a helper class explained in an article by | |
47 | Nathan C. Myers.\n | |
48 | See it at \link http://www.cantrip.org/emptyopt.html | |
49 | **/ | |
50 | ||
51 | template < class Data, class FunctorList > | |
52 | struct data_with_functor_bag : | |
53 | ||
54 | public mpl::inherit_linearly< | |
55 | ||
56 | FunctorList, | |
57 | mpl::if_< is_base_of< mpl::_2, mpl::_1 >, | |
58 | // { | |
59 | mpl::_1, | |
60 | // } | |
61 | // else | |
62 | // { | |
63 | mpl::inherit< mpl::_1, mpl::_2 > | |
64 | // } | |
65 | > | |
66 | ||
67 | >::type | |
68 | { | |
69 | Data data; | |
70 | ||
71 | data_with_functor_bag() {} | |
72 | ||
73 | data_with_functor_bag(BOOST_DEDUCED_TYPENAME add_reference<Data>::type d) | |
74 | : data(d) {} | |
75 | ||
76 | template< class Functor > | |
77 | Functor& functor() | |
78 | { | |
79 | return *(static_cast<Functor*>(this)); | |
80 | } | |
81 | ||
82 | template< class Functor > | |
83 | const Functor& functor() const | |
84 | { | |
85 | return *(static_cast<Functor const *>(this)); | |
86 | } | |
87 | }; | |
88 | ||
89 | } // namespace detail | |
90 | } // namespace container_adaptor | |
91 | } // namespace bimaps | |
92 | } // namespace boost | |
93 | ||
94 | #if defined(BOOST_MSVC) | |
95 | # pragma warning(pop) | |
96 | #endif | |
97 | ||
98 | #endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_FUNCTOR_BAG_HPP | |
99 | ||
100 |